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Income Taxes - Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 17,557 $ 18,307 $ 13,939
State 3,302 3,472 2,989
Current Income Tax Expense (Benefit), Total 20,859 21,779 16,928
Deferred:      
Federal (5,895) (338) (1,255)
State (284) (267) (260)
Deferred Income Tax Expense (Benefit), Total (6,179) (605) (1,515)
Total tax expense $ 14,680 $ 21,174 $ 15,413